Add support for bastion hosts

Fallback to default resolver if no nameservers

Update docker to 1.12.5

Bump kube_version to v1.5.1

Rework Gitlab pipeline stages for PRs/merges

Run 1 of each part1/2/special for Gitlab CI only for PRs
Remaining 2/3 of each stage are manual steps for master only (merges)

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Revert "Fix wrong path for dhclient.conf on RedHat/CentOS"

Current design expects users to define at least one
nameserver in the nameservers var to backup host OS DNS config
when the K8s cluster DNS service IP is not available and hosts
still have to resolve external or intranet FQDNs.

Fix undefined nameservers to fallback to the default_resolver.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Note the new ubuntu/debian version string change:
https://github.com/docker/docker/issues/29355

Fix weave restart after docker daemon restart

Add dns_domain for each host to /etc/hosts

Fix wrong path for dhclient.conf on RedHat/CentOS

Manual steps for Gitlab CI pipeline

* Reduce default testcase to 2 nodes, add HA case.
* Adjust gen_matrix script for Travis/Gitlab CIs.
* Enable netchecker deploy foro gitlab CI.
* Sync other things from travis matrix and reorder them as build steps
  for pull requests, master branch, auto/manual.
* Do auto-step1 from part1 and manual step2,3 for branches/PRs.
* Do manual steps from part2, special for master merges.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Consider netcheck passed if agents can't report in time

Fix etcd member list when upgrading ETCD from an old version

Add deployment from gitlab-ci

Fixes #754

Double the time to wait for the netcheck agents.
Do not fail CI build, if agents can't report in time.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Set net.ipv4.ip_forward=1 on all systems, not only on GCE

/etc/dhclient.conf is ignored on RedHat/CentOS
Correct location is /etc/dhcp/dhclient.conf

Add calico/routereflector support

Rebalance CI GCE zones for better CPU per region usage

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Add support for cloud-provider based networking

Enable netchecker for CI

Add BGP route reflectors support in order to optimize BGP topology
for deployments with Calico network plugin.

Also bump version of calico/ctl for some bug fixes.

* Enable netchecker app for CI postinstall tests
* Rework outputs and better coverage to the ping between pods post
intall test case. With netchecker deployed, the test covers hostnet
to hostnet and standard to standrad pods ping check as well.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Fix kube_version to include 'v' again

https://github.com/kubernetes-incubator/kargo/pull/736 missed this

Address standalone kubelet config case